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©2019 NEC Display Solutions, Ltd. Page 62 of 74
Problem: “RPi Boot” is unable to detect the Compute Module
Solutions:
• If the display is currently in a power save mode (LED is flashing green), press the POWER ON
button on the IR Remote control.
• On the COMPUTE MODULE menu of the OSD, confirm that POWER SUPPLY is set to ON.
• On the COMPUTE MODULE menu of the OSD, confirm that USB BOOT MODE is set to ENABLE.
Note: The Compute Module power will have to be cycled off and on after changing the boot
mode to ENABLE.
• Check that the Compute Module is correctly seated and latched in the SO-DIMM socket on the
Interface board.
• Check that a USB cable is connected from the USB2 connector on the display to the host PC.
• Do not use a USB extender cable or hub between the host PC and the display. The host PC must
be directly connected to the display via a single USB cable.
• “RPi Boot” may have already been run while the Compute Module has been powered up in boot
mode. Running it again will not find the Compute Module.
• Disconnect and reconnect the USB cable to the host PC.
Problem: 3
rd
party IR Remote is not functioning
Solutions:
• Confirm the OSD COMPUTE MODULE setting for IR SIGNAL is set to ENABLE
• Confirm lirc is enabled in the
config.txt file.
• Confirm the software being used is correctly configured for the 3
rd
party remote.
• Use lirc debugging mode to view the raw IR sensor output.
• CEC support may be enabled. Normally CEC support must be disabled in order for lirc to work
correctly.
Problem: Serial communications with the display not functioning
Solutions:
• Confirm the OSD COMPUTE MODULE setting for MONITOR CONTROL is set to ENABLE
• Confirm the
config.txt file contains the following line:
enable_uart=1
If using the Compute Module 3, the following two lines are also necessary:
dtoverlay=uart1
core_freq=250
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